Maintain, inspect, troubleshoot, and repair loading dock equipment, including dock levelers, dock locks, truck restraints, shelters, seals, dock lights, overhead doors, high-speed doors, roll-up doors, personnel doors, and associated controls and safety devices. Operate, monitor, inspect, troubleshoot, repair, and perform preventive maintenance on Freon-based refrigeration systems serving coolers and freezers, including compressors, condensers, evaporators, fans, motors, controls, refrigerant circuits, and related equipment.